Help setting DMVPN tunnel source to Loopback 0

OK. I am trying to set up a hub/spoke DMVPN to use the Loopback 0 as the tunnel sourec on the spokes. Right now I have about 150 spokes all using the F0/0 interface, but since that CAN be duplicated (by a home office such as a linksys giving out 192.168.1.x addresses) I want to change that to the Lo0 address. We have a scheme how that each spoke gets a 172.28.x.0/24. the Lo0 scheme will be 10.172.28.x/32, so each spoke will have a unique Lo0 controlled by us. The problem is that it won't come up with Lo0 as the source. I believe I have all of the relevant config below, and can add anything that is missing. The problem I am getting is that the tunnel gets stuck in NHRP - the tunnel interface is up/up, but eigrp doesn't come up and the tunnel will not pass traffic.

Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...
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